#pragma GCC system_header
-#ifndef __GXX_EXPERIMENTAL_CXX0X__
+#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#endif // _GLIBCXX_HAS_GTHREADS && _GLIBCXX_USE_C99_STDINT_TR1
-#endif // __GXX_EXPERIMENTAL_CXX0X__
+#endif // C++11
#endif // _GLIBCXX_CONDITION_VARIABLE